When a nation is righteous, the blessing of God is there. The Sun is righteous in that it shines on both the wicked and the saints, just like, the Son of God, Jesus is.
When you are dead to sin, then you will live righteously. Only the right living people can claim healing. It is time to live righteously. If you have confessed your sin, then you are right, then you are free to claim healing.
You are dead to yourself not for your own personal living but you are on display for others to see.
The first title of Jesus was King of righteousness, He is also King of Salem (Peace). Hence, those who serve Him should be like Him, full of righteousness and peace.